JPS6310680B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a motor-generator control device, and more particularly to a motor-generator control device that improves control responsiveness by increasing the detection sensitivity of a frequency detection section in a vehicle motor-generator.

The prior art and its problems will be explained with reference to the control block diagram in FIG. In Figure 1, 1 is a pantograph, 2 is a starting contactor, 3 is an electric motor, 4 is a shunt field of the electric motor, 5 and 6 are the sum field and differential field of the electric motor, respectively, and 7 is an alternating current generator. 8 and 9 are a sum control thyristor and a differential control thyristor of the electric motor, respectively; 10 is a field control thyristor of the electric motor;
11 is a frequency detection section, 12 is a frequency control section, 13
indicate the voltage control section, respectively. When the starting contactor 2 is turned on, the electric motor 3 rotates, and the alternator 7 directly connected to the electric motor 3 rotates to generate two-phase alternating current with a phase shift of 90 degrees in its output winding. This generated frequency is detected by the frequency detection section and the frequency -
The voltage is converted and given to the frequency control unit 12 as a voltage signal proportional to the frequency, and the sum field thyristor 8 and the differential field thyristor 9 control the sum field thyristor 8 and the differential field thyristor 9 so that the generator generated frequency matches the set frequency. 5
and controls the field current flowing through the differential field 6. Further, the voltage control unit 13 detects the generator output voltage and controls the generator field current via the generator field control thyristor 10 so that the output voltage matches the set voltage. By performing such control, it becomes possible to perform feedback control to match the generator generated frequency and output voltage to respective set values in response to transient rotational changes of the electric motor 3.

Here, the detection of the generated frequency in the frequency detection section 11 has conventionally been a method of detecting the generator frequency itself, which is generally generated in the U phase or the V phase. However, with this conventional method, changes in frequency,
In other words, changes in the rotation speed of the generator can only be detected by changes in the generated frequency, and the detection sensitivity is low.
For example, when attempting to implement an all-IC control system for a motor generator for a vehicle, the frequency -
The problem is that the response of voltage conversion is poor, which causes instability in the entire system, making it impossible to obtain stable output from the alternator (i.e., constant frequency and constant voltage during startup, load fluctuations, and input voltage fluctuations). It was hot.

The purpose of the present invention is to solve the above-mentioned problems in the conventional technology, improve detection sensitivity to frequency changes by detecting the frequency generated by the generator as a doubled frequency, and achieve stable generator output. An object of the present invention is to provide a motor-generator control device capable of controlling a motor generator.

In order to achieve the above object, the features of the present invention are as follows:
By connecting the outputs of adjacent phases of the generator output to the primary windings of the transformers, performing full-wave rectification of the outputs of the secondary windings of each transformer, and matching the rectified outputs through a load resistor, the generator The purpose of the present invention is to provide a frequency detection section that detects a frequency that is a multiple of the output frequency.

The present invention will be explained below with reference to the drawings.

FIG. 2 is an explanatory diagram of an embodiment of the present invention, in which a is a circuit diagram, b is a waveform diagram of an input signal, and c is a waveform diagram of an output signal. Alternating currents with phases different by 90 degrees are input to the primary sides U-O and V-O of the transformer 21. The U-phase and V-phase outputs of the secondary side of the transformer 21 are rectified by independent full-wave rectifiers 22 and 23, respectively. Load resistors 24 and 25 are connected to the output sides of the full-wave rectifiers 22 and 23, respectively, so that a full-wave rectified waveform appears at both ends. When this load resistor and a full-wave rectifier are connected as shown in the circuit diagram in Figure 2a, and the outputs of the full-wave rectifiers 22 and 23 are matched by the load resistor, the input waveform U-O is generated between A and B. or V
- An output waveform with twice the frequency of O is obtained. In other words, the waveform between A and B is a waveform obtained by adding the waveforms of A to O and the waveforms of O to B from time to time (equivalent to the subtraction of the waveforms of A to O and the waveforms of B to O), and is the waveform of the input waveform.
At the 45 degree point, A~O and O~B cancel each other out, and at the 90 degree point, either A~O or O~B has a zero value, so the matching waveform is twice as large as the input waveform. It has a frequency and the voltage level remains the original AC waveform.

This circuit in FIG. 2a is connected to the frequency detection section 1 in FIG.
By using it for frequency detection in step 1, it is possible to double the frequency while keeping the voltage level the same, compared to using the U-phase or V-phase output frequency of the conventional method. - Improves responsiveness in voltage conversion and subsequent control systems.

Although the above embodiment has been described as a two-phase alternating current with a phase shift of 90 degrees, even if the phase shift is not exactly 90 degrees, the voltage level will be somewhat lower, but
Since it is possible to obtain alternating current with a frequency doubled, and this doubled frequency alternating current signal is frequency-voltage converted, the frequency detection sensitivity is almost the same as when the phase shift is exactly 90 degrees. Sensitivity.

As described above, according to the present invention, by adding a simple circuit section consisting of a transformer, a full-wave rectifier, and a resistor to the input side of the frequency detection section, the frequency detection sensitivity is improved compared to the conventional method. This can be doubled, thereby making it possible to improve the responsiveness of the motor generator control system.

[Brief explanation of the drawing]

FIG. 1 is a control block diagram of a conventional device, and FIG. 2 is an explanatory diagram of an embodiment of the present invention, in which a is a circuit diagram, b is a waveform diagram of an input signal, and c is a waveform diagram of an output signal. 3...Electric motor, 4...Shunt field, 5...Water field, 6
...Differential field, 7... Generator, 11... Frequency detection section,
12... Frequency control section, 13... Voltage control section, 21...
Transformer, 22, 23...Full wave rectifier, 24, 25
…Load resistance.

Claims (1)

[Claims] 1. An electric motor driven by an input power source, a generator driven by this electric motor that outputs two-phase alternating current with a phase shift of 90 degrees, and generator field control that detects the generator output voltage and controls it to match the set value. a frequency detection section that detects the generator output frequency and converts it into a voltage signal; and a frequency control section that controls the motor field so that the converted voltage signal matches a set value. In the control device, the two-phase alternating current output from the generator is connected to the primary winding of each transformer, the output of the secondary winding of each transformer is full-wave rectified, and the two rectified outputs are butted together through a load resistor. A motor-generator control device characterized in that the frequency detecting section detects a double frequency of the generator output frequency.